When did professional cyclists begin wearing helmets, and how long did it take from there for it to become mandatory in races? - Quora
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From the sausage bicycle helmet to the folding bicycle helmet, the great history of the bicycle
From the sausage bicycle helmet to the folding bicycle helmet, the great history of the bicycle helmet
The Evolution Of Bicycle Helmets | Gearist
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Bike helmet sizes explained: how to measure your bike helmet size - BikeRadar
